﻿using System;
using System.Collections.Generic;
using System.IO;
using System.IO.Compression;
using System.Linq;
using System.Net;
using System.Text;
using System.Web;


namespace OF.Security.Utils
{
    public class RequestHelper
    {
       

        /// <summary>
        /// 获取接口内容，获取html信息，常用于查询指定url的内容信息
        /// </summary>
        /// <param name="url">接口地址</param>
        /// <param name="method">GET或者POST</param>
        /// <param name="pEncoding">字符编码</param>
        /// <param name="content">成功则返回内容，失败则返回错误信息</param>
        /// <param name="timeOut"></param>
        /// <returns></returns>
        public static bool GetHtml(string url, string method, Encoding pEncoding,out string content, int timeOut = 30000)
        {
            bool bReturn = false;
            int num = 0;
            HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
            string szContent = string.Empty;
            #region 模拟百度爬虫
            request.UserAgent = "User-Agent: Mozilla/5.0+(Windows+NT+6.0;+WOW64;+rv:31.0)+Gecko/20100101+Firefox/31.0";
            //Mozilla/5.0 (Windows NT 6.1; WOW64; rv:31.0) Gecko/20100101 Firefox/31.0
            request.Accept = "*/*";
            //request.KeepAlive = true;
            request.Headers.Add("Accept-Language", "zh-cn,en-us;q=0.5");
            request.Headers.Add("Authorization", MakeAuthorationHeaderValue(url));
            #endregion

            request.Method = method;

            //给post请求增加请求数据
            if (method.ToLower() == "post")
            {
                string data = url.Substring(url.IndexOf("?") + 1);
                byte[] byteArray = pEncoding.GetBytes(data);
                request.ContentLength = byteArray.Length;
                Stream stream = request.GetRequestStream();
                stream.Write(byteArray, 0, byteArray.Length);
                stream.Close();
            }

            //request.Method = method;
            request.MaximumAutomaticRedirections = int.MaxValue;
            //允许请求重定向  默认值为false
            request.AllowAutoRedirect = true;
            request.Timeout = timeOut;
            while (num < 3 && string.IsNullOrEmpty(szContent))
            {
                try
                {

                    HttpWebResponse objResponse = request.GetResponse() as HttpWebResponse;
                    if (objResponse.StatusCode == HttpStatusCode.OK)
                    {
                        Stream objStream = objResponse.GetResponseStream();
                        StreamReader objStreamReader = new StreamReader(objStream, pEncoding);
                        objStream.ReadTimeout = 15000;
                        szContent = objStreamReader.ReadToEnd();
                        objStreamReader.Close();
                        objStreamReader.Dispose();
                        objResponse.Close();
                        bReturn = true;
                    }
                    else if (objResponse.StatusCode == HttpStatusCode.NoContent)
                    {

                    }
                    else
                    {
                        szContent = "接口服务出错";

                    }
                   
                }
                catch (Exception ex)
                {
                    bReturn = false;
                    szContent = ex.Message;
                }
                finally
                {
                    num++;
                }
            }
            content = szContent;
            return bReturn;

        }

        /// <summary>
        /// post保存json信息
        /// </summary>
        /// <param name="url"></param>
        /// <param name="jsonParam"></param>
        /// <param name="pEncoding"></param>
        /// <param name="content"></param>
        /// <param name="timeOut"></param>
        /// <returns></returns>
        public static bool PostJsonToWebApi(string url,string jsonParam,Encoding pEncoding, out string content,int timeOut = 30000)
        {
            bool bReturn = false;
            int num = 0;
            string szContent = string.Empty;
            HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
           
      
            //request.UserAgent = "User-Agent: Mozilla/5.0+(Windows+NT+6.0;+WOW64;+rv:31.0)+Gecko/20100101+Firefox/31.0";
            //Mozilla/5.0 (Windows NT 6.1; WOW64; rv:31.0) Gecko/20100101 Firefox/31.0
            request.Accept = "*/*";
            //request.KeepAlive = true;
            //request.Headers.Add("Accept-Language", "zh-cn,en-us;q=0.5");

            request.Headers.Add("Authorization", MakeAuthorationHeaderValue(url));
            request.Method = "post";
            request.ContentType = "application/json";
           
          
            while (num < 3 && string.IsNullOrEmpty(szContent))
            {
                try
                {
                    byte[] byteArray = pEncoding.GetBytes(jsonParam);
                    request.ContentLength = byteArray.Length;
                    Stream stream = request.GetRequestStream();
                    stream.Write(byteArray, 0, byteArray.Length);
                    stream.Close();

                    //request.Method = method;
                    request.MaximumAutomaticRedirections = int.MaxValue;
                    //允许请求重定向  默认值为false
                    request.AllowAutoRedirect = true;
                    request.Timeout = timeOut;
                    HttpWebResponse objResponse = request.GetResponse() as HttpWebResponse;
                    if (objResponse.StatusCode == HttpStatusCode.OK)
                    {
                        Stream objStream = objResponse.GetResponseStream();
                        StreamReader objStreamReader = new StreamReader(objStream, pEncoding);
                        objStream.ReadTimeout = 15000;
                        szContent = objStreamReader.ReadToEnd();
                        objStreamReader.Close();
                        objStreamReader.Dispose();
                        objResponse.Close();
                        bReturn = true;
                    }
                    else if (objResponse.StatusCode == HttpStatusCode.NoContent)
                    {

                    }
                    else
                    {
                        szContent = "接口服务出错";
                    }
                   
                }
                catch (Exception ex)
                {
                    bReturn = false;
                    szContent = ex.Message;
                }
                finally
                {
                    num++;
                }
            }
            content = szContent;
            return bReturn;

        }

        /// <summary>
        /// 使用Post方法获取字符串结果
        /// </summary>
        /// <param name="url"></param>
        /// <param name="formItems">Post表单内容</param>
        /// <param name="content">返回结果</param>
        /// <param name="cookieContainer"></param>
        /// <param name="timeOut">默认20秒</param>
        /// <param name="refererUrl"></param>
        /// <param name="encoding">响应内容的编码类型（默认utf-8）</param>
        /// <returns></returns>
        public static bool PostForm(string url, List<FormItemModel> formItems, out string content, CookieContainer cookieContainer = null, string refererUrl = null, Encoding encoding = null, int timeOut = 30000)
        {

            bool bReturn = false;
            int num = 0;
            string szContent = string.Empty;
            encoding=encoding ?? Encoding.UTF8;
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
            #region 初始化请求对象
            request.Method = "POST";
            request.Timeout = timeOut;
            request.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8";
            request.KeepAlive = true;
            request.UserAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.57 Safari/537.36";
            if (!string.IsNullOrEmpty(refererUrl))
                request.Referer = refererUrl;
            if (cookieContainer != null)
                request.CookieContainer = cookieContainer;
            request.Headers.Add("Authorization", MakeAuthorationHeaderValue(url));

            #endregion

            string boundary = "----" + DateTime.Now.Ticks.ToString("x");//分隔符
            request.ContentType = string.Format("multipart/form-data; boundary={0}", boundary);
            //请求流
            var postStream = new MemoryStream();
            #region 处理Form表单请求内容
            //是否用Form上传文件
            var formUploadFile = formItems != null && formItems.Count > 0;
            if (formUploadFile)
            {
                //文件数据模板
                string fileFormdataTemplate =
                    "\r\n--" + boundary +
                    "\r\nContent-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"" +
                    "\r\nContent-Type: application/octet-stream" +
                    "\r\n\r\n";
                //文本数据模板
                string dataFormdataTemplate =
                    "\r\n--" + boundary +
                    "\r\nContent-Disposition: form-data; name=\"{0}\"" +
                    "\r\n\r\n{1}";
                foreach (var item in formItems)
                {
                    string formdata = null;
                    if (item.IsFile)
                    {
                        //上传文件
                        formdata = string.Format(
                            fileFormdataTemplate,
                            item.Key, //表单键
                            item.FileName);
                    }
                    else
                    {
                        //上传文本
                        formdata = string.Format(
                            dataFormdataTemplate,
                            item.Key,
                            item.Value);
                    }

                    //统一处理
                    byte[] formdataBytes = null;
                    //第一行不需要换行
                    if (postStream.Length == 0)
                    {
                        formdataBytes = Encoding.UTF8.GetBytes(formdata.Substring(2, formdata.Length - 2));
                        //formdataBytes = Encoding.UTF8.GetBytes(formdata);
                    }
                    else
                    {
                        formdataBytes = Encoding.UTF8.GetBytes(formdata);
                    }
                       
                    
                       
                    postStream.Write(formdataBytes, 0, formdataBytes.Length);

                    //写入文件内容
                    if (item.FileContent != null && item.FileContent.Length > 0)
                    {
                        using (var stream = item.FileContent)
                        {
                            byte[] buffer = new byte[1024];
                            int bytesRead = 0;
                            while ((bytesRead = stream.Read(buffer, 0, buffer.Length)) != 0)
                            {
                                postStream.Write(buffer, 0, bytesRead);
                            }
                        }
                    }
                }
                //结尾
                var footer = Encoding.UTF8.GetBytes("\r\n--" + boundary + "--\r\n");
                postStream.Write(footer, 0, footer.Length);

            }
            else
            {
                request.ContentType = "application/x-www-form-urlencoded";
            }
            #endregion

            request.ContentLength = postStream.Length;

            #region 输入二进制流
            if (postStream != null)
            {
                postStream.Position = 0;
                //直接写入流
                Stream requestStream = request.GetRequestStream();

                byte[] buffer = new byte[1024];
                int bytesRead = 0;
                while ((bytesRead = postStream.Read(buffer, 0, buffer.Length)) != 0)
                {
                    requestStream.Write(buffer, 0, bytesRead);
                }
                postStream.Close();//关闭文件访问
            }
            #endregion


            #region 获取请求数据
            while (num < 3 && string.IsNullOrEmpty(szContent))
            {
                try
                {

                    HttpWebResponse objResponse = request.GetResponse() as HttpWebResponse;
                    if (cookieContainer != null)
                    {
                        objResponse.Cookies = cookieContainer.GetCookies(objResponse.ResponseUri);
                    }
                    if (objResponse.StatusCode == HttpStatusCode.OK)
                    {
                        Stream objStream = objResponse.GetResponseStream();
                        StreamReader objStreamReader = new StreamReader(objStream, encoding);
                        objStream.ReadTimeout = 30000;
                        szContent = objStreamReader.ReadToEnd();
                        objStreamReader.Close();
                        objStreamReader.Dispose();
                        objResponse.Close();
                        bReturn = true;
                    }
                    else if (objResponse.StatusCode == HttpStatusCode.NoContent)
                    {
                        
                    }
                    else
                    {
                        szContent = "接口服务出错";
                    }

                }
                catch (Exception ex)
                {
                    bReturn = false;
                    szContent = ex.Message;
                }
                finally
                {
                    num++;
                }
            } 
            #endregion
            content = szContent;
            return bReturn;
        }

        /// <summary>
        /// 把数组所有元素，按照“参数=参数值”的模式用“&”字符拼接成字符串，并对参数值做urlencode
        /// </summary>
        /// <param name="dicArray">需要拼接的数组</param>
        /// <param name="code">字符编码</param>
        /// <returns>拼接完成以后的字符串</returns>
        public static string CreateLinkStringUrlencode(Dictionary<string, string> dicArray, Encoding code)
        {
            StringBuilder prestr = new StringBuilder();
            foreach (KeyValuePair<string, string> temp in dicArray)
            {
                prestr.Append(temp.Key + "=" + HttpUtility.UrlEncode(temp.Value, code) + "&");
            }
            //去掉最後一個&字符
            int nLen = prestr.Length;
            prestr.Remove(nLen - 1, 1);
            return prestr.ToString();
        }

        /// <summary>
        /// 生成token
        /// </summary>
        /// <param name="url"></param>
        /// <returns></returns>
        static string MakeAuthorationHeaderValue(string url)
        {
            string szReturn = string.Empty;
            var scheme = "BMCW ";
            string key = "cgs";
           
            int ms = DateTime.Now.Millisecond;
            if (ms < 100)
            {
                ms += 100;
            }
            string token;
            if (url.Length > 32)
            {
                token = key + url.Substring(8, 24) + ms;
            }
            else
            {
                token = key + url.Substring(9) + ms;
            }
            szReturn= ms+MD5Helper.MD5String(token);
            return scheme + szReturn;
        }

        /// <summary>
        /// 获取当前请求路径
        /// </summary>
        /// <returns></returns>
        public static string GetRequestUrl()
        {
            if (HttpContext.Current != null && HttpContext.Current.Request != null)
            {
                return HttpContext.Current.Request.RawUrl;
            }
            else
            {
                return "";
            }
        }
        /// <summary>
        /// 获取当前服务器名称
        /// </summary>
        /// <returns></returns>
        public static string GetServerName()
        {
            if (HttpContext.Current != null)
            {
                return HttpContext.Current.Server.MachineName;
            }
            else
            {
                return "127.0.0.1";
            }
        }
    }

    /// <summary>
    /// 表单数据项
    /// </summary>
    public class FormItemModel
    {
        /// <summary>
        /// 表单键，request["key"]
        /// </summary>
        public string Key { set; get; }
        /// <summary>
        /// 表单值,上传文件时忽略，request["key"].value
        /// </summary>
        public string Value { set; get; }
        /// <summary>
        /// 是否是文件
        /// </summary>
        public bool IsFile
        {
            get
            {
                if (FileContent == null || FileContent.Length == 0)
                {
                    return false;
                }
                if (FileContent != null && FileContent.Length > 0 && string.IsNullOrWhiteSpace(FileName))
                {
                    throw new Exception("上传文件时 FileName 属性值不能为空");
                }
                return true;
            }
        }
        /// <summary>
        /// 上传的文件名
        /// </summary>
        public string FileName { set; get; }
        /// <summary>
        /// 上传的文件内容
        /// </summary>
        public Stream FileContent { set; get; }
    }
}
